21388851

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{83}}^1\times {\mathrm{137}}^1$

素因数の和:256

約数の個数: 48

約数和(自身を含む): 36167040

約数和(自身を除く): 14778189

約数列:

[1, 3, 9, 11, 19, 33, 57, 83, 99, 137, 171, 209, 249, 411, 627, 747, 913, 1233, 1507, 1577, 1881, 2603, 2739, 4521, 4731, 7809, 8217, 11371, 13563, 14193, 17347, 23427, 28633, 34113, 52041, 85899, 102339, 125081, 156123, 216049, 257697, 375243, 648147, 1125729, 1944441, 2376539, 7129617, 21388851]

約数ペア:

[(1, 21388851), (3, 7129617), (9, 2376539), (11, 1944441), (19, 1125729), (33, 648147), (57, 375243), (83, 257697), (99, 216049), (137, 156123), (171, 125081), (209, 102339), (249, 85899), (411, 52041), (627, 34113), (747, 28633), (913, 23427), (1233, 17347), (1507, 14193), (1577, 13563), (1881, 11371), (2603, 8217), (2739, 7809), (4521, 4731)]